package com.littlespider.mylibrary.util;

import android.content.Context;
import android.content.SharedPreferences;
import android.util.Base64;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.StreamCorruptedException;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Map;

public class SPUtils
{
	public SPUtils()
	{
		/* cannot be instantiated */
		throw new UnsupportedOperationException("cannot be instantiated");
	}

	/**
	 * 保存在手机里面的文件名
	 */
	public static final String FILE_NAME = "share_data";

	/**
	 * 保存数据的方法，我们需要拿到保存数据的具体类型，然后根据类型调用不同的保存方法
	 * 
	 * @param context
	 * @param key
	 * @param object
	 */
	public static void put(Context context, String key, Object object)
	{

		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();

		if (object instanceof String)
		{
			editor.putString(key, (String) object);
		} else if (object instanceof Integer)
		{
			editor.putInt(key, (Integer) object);
		} else if (object instanceof Boolean)
		{
			editor.putBoolean(key, (Boolean) object);
		} else if (object instanceof Float)
		{
			editor.putFloat(key, (Float) object);
		} else if (object instanceof Long)
		{
			editor.putLong(key, (Long) object);
		} else
		{
			editor.putString(key, object.toString());
		}

		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 得到保存数据的方法，我们根据默认值得到保存的数据的具体类型，然后调用相对于的方法获取值
	 * 
	 * @param context
	 * @param key
	 * @param defaultObject
	 * @return
	 */
	public static Object get(Context context, String key, Object defaultObject)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);

		if (defaultObject instanceof String)
		{
			return sp.getString(key, (String) defaultObject);
		} else if (defaultObject instanceof Integer)
		{
			return sp.getInt(key, (Integer) defaultObject);
		} else if (defaultObject instanceof Boolean)
		{
			return sp.getBoolean(key, (Boolean) defaultObject);
		} else if (defaultObject instanceof Float)
		{
			return sp.getFloat(key, (Float) defaultObject);
		} else if (defaultObject instanceof Long)
		{
			return sp.getLong(key, (Long) defaultObject);
		}

		return null;
	}
	
	
	
	
	public static SharedPreferences getSp(Context context)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
			return sp;
	}
	/**
	 * 移除某个key值已经对应的值
	 * 
	 * @param context
	 * @param key
	 */
	public static void remove(Context context, String key)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();
		editor.remove(key);
		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 清除所有数据
	 * 
	 * @param context
	 */
	public static void clear(Context context)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();
		editor.clear();
		SharedPreferencesCompat.apply(editor);
	}

	/**
	 * 查询某个key是否已经存在
	 * 
	 * @param context
	 * @param key
	 * @return
	 */
	public static boolean contains(Context context, String key)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		return sp.contains(key);
	}

	/**
	 * 返回所有的键值对
	 * 
	 * @param context
	 * @return
	 */
	public static Map<String, ?> getAll(Context context)
	{
		SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		return sp.getAll();
	}

	/**
	 * 创建一个解决SharedPreferencesCompat.apply方法的一个兼容类
	 * 
	 * @author zhy
	 * 
	 */
	private static class SharedPreferencesCompat
	{
		private static final Method sApplyMethod = findApplyMethod();

		/**
		 * 反射查找apply的方法
		 * 
		 * @return
		 */
		@SuppressWarnings({ "unchecked", "rawtypes" })
		private static Method findApplyMethod()
		{
			try
			{
				Class clz = SharedPreferences.Editor.class;
				return clz.getMethod("apply");
			} catch (NoSuchMethodException e)
			{
			}

			return null;
		}

		/**
		 * 如果找到则使用apply执行，否则使用commit
		 * 
		 * @param editor
		 */
		public static void apply(SharedPreferences.Editor editor)
		{
			try
			{
				if (sApplyMethod != null)
				{
					sApplyMethod.invoke(editor);
					return;
				}
			} catch (IllegalArgumentException e)
			{
			} catch (IllegalAccessException e)
			{
			} catch (InvocationTargetException e)
			{
			}
			editor.commit();
		}
	}
	
	
    public static void saveBean(Context context,String key,Object bean) {  
    	SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);
		SharedPreferences.Editor editor = sp.edit();  
        // 创建字节输出流  
        ByteArrayOutputStream baos = new ByteArrayOutputStream();  
        try {  
            // 创建对象输出流，并封装字节流  
            ObjectOutputStream oos = new ObjectOutputStream(baos);  
            // 将对象写入字节流  
            oos.writeObject(bean);  
            // 将字节流编码成base64的字符窜  
//            String Base64String = new String(Base64.encodeBase64(baos.toByteArray()));
            String Base64String = Base64.encodeToString(baos.toByteArray(), Base64.DEFAULT);
            editor.putString(key, Base64String);
            SharedPreferencesCompat.apply(editor);  
        } catch (IOException e) {  
            // TODO Auto-generated  
        }  
    } 
    
    
    public static <T> T getBean(Context context,String key,Class<T> obj) {
    	SharedPreferences sp = context.getSharedPreferences(FILE_NAME,
				Context.MODE_PRIVATE);  
        String productBase64 = sp.getString(key, "");  
         Object bean = null;         
        //读取字节  
        byte[] base64 = Base64.decode(productBase64.getBytes(),Base64.DEFAULT);  
          
        //封装到字节流  
        ByteArrayInputStream bais = new ByteArrayInputStream(base64);  
        try {  
            //再次封装  
            ObjectInputStream bis = new ObjectInputStream(bais);  
            try {  
                //读取对象  
                bean =  bis.readObject();  
            } catch (ClassNotFoundException e) {  
                // TODO Auto-generated catch block  
                e.printStackTrace();  
            }  
        } catch (StreamCorruptedException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        } catch (IOException e) {  
            // TODO Auto-generated catch block  
            e.printStackTrace();  
        }
		if(null != bean){
			return  (T)bean;
		}else{
			return null;
		}

    } 

}